AutoDWG DWG DWF Converter a batch converter converts DWG/DXF to DWF without need of AutoCAD. It supports AutoCAD version R9 to latest version AutoCAD 2005.
TigerCad
2D-CAD Primarily for mechanical, architectural and diagramming. For professionals with complex drawings, but also approachable and easy to learn for newcomers. Comprehensive manual and online help. Emphasis on drawing efficiency. Save in DXF.
STL Editor
STL Editor 1.0 is a Stereolithography (.STL) file viewing, editing and printing application. STL Editor 1.0 has been designed keeping Rapid Prototyping machines in mind. It offers many helpful STL file editing features.
Look
The program is intended for creation and optimization of cutting tickets of sheet materials. In it fast input of the information on orders and materials is provided; automatic and manual formation of cutting tickets; print of cutting tickets
GStarICAD
GStarICAD is the geniune CAD drawing software based on IntelliCAD,and it is 99% idential to AutoCAD but with a competitive price.GStarICAD offers a 30days free tryout after free download this software
LITIO - 3D Sheet metal unfolder
Sheet metal for AutoCAD. It calculates flat (unfolded) sheet development of ducts, rectangle to ound transitions, cylinders, cones, intersections, connections, bifurcations, elbows, etc. For HVAC, hoppers, cyclones, ducts, silos, piping, etc.